The 3CX*****A7 family of tubes (3CX10,000A7, 3CX15,000A7, and 3CX20,000A7) are air cooled triodes that can be run in the grounded grid cathode driven configuration, similar to the more common 3CX1500A7 (8877) used in certain Alpha and Ameritron amps for example.

Assuming it is run in a properly constructed amp, a 3CX15,000A7 will deliver around 20-25KW out with 1500 watts drive.

I am not advocating this, but there are HAMs (not just CBer's) who run this much power.

At my shop (where my main HAM shack is located) I have a 240 volt 200 amp single phase service. From the P=EI formula 240V X 200A = 48,000 Watts. That means I COULD run a 48,000 watt amp on my single phase service. Granted 3 phase would be a better option, but it can be done on a single phase service. In fact the local power company will supply up to a 400 amp (96,000 watt) residential service if needed.

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